1 Answer
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Run any command from Quicksilver? Just enter text mode (by pressing .), enter your command and choose either the "Run Text Command in Terminal" action (opens a new terminal window and runs the command) or the "Run Command in Shell" action (runs the command in the background and returns the results to Quicksilver)

Run a script? Just browse to the script and choose the "Run" or "Run in Terminal [...]" actions.